Comments about Adorama Adorama 55mm Metal Lens Hood:
you can't use the lens filters with this hood. You have to buy oversized filters instead. That is a poor design as far as I am concerned. Maybe get a hood directly from Sigma instead of an after market one.
Comments about Adorama Adorama 55mm Metal Lens Hood:
It needs a filter thread to hold the cap. You must choose either a cap or the hood on your lens. Also, the inside flat black coating is very uneven. It should have been anodized like the outside.